Re: Strangeness with speed

[Владимир Калачихин]

15.02.2022 21:38, Gary E. Miller пишет:
> Sorry, I read my emails in reverse order, and did not expect this email
> train.

No problem.

> So instead of this:
>
>
> $GPRMC,114618.00, ...
> $GPGGA,114618.00, ...
> $GPRMC,114618.00, ...
> $GPGGA,114618.00, ...
>
> This:
>
> $GPRMC,114618.01, ...
> $GPGGA,114618.01, ...
> $GPRMC,114618.02, ...
> $GPGGA,114618.02, ...
>
> That way gpsd knows which GPRMC belongs with which GPGGA.

I'm sorry, Gary, but it doesn't make any difference.

First: the time on this file is not constant - it changes every second.
Second: this file is understood by gpsd fine.

Strangeness occurs only if several GGA sentences have the same time 
within the current second. If time in the past - no problem with same times.

But now I understand that speed == 0 if two consecutive GGA sentences 
have the same time is normal, not strangeness. Strangeness is that speed 
== null if gpsd receives a few GGA sentences with consecutive timestamps.
Did you say that the speed should be calculated? This is not happening 
at least for gpsd 3.20




Владимир Калачихин